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The B1497204 is a genuine OEM 144°C fusible link (thermal cutoff / one-shot safety fuse) for the Goodman GDE120-5 gas furnace. Wired in series with the control circuit, this link opens permanently if temperatures exceed its 144°C (291°F) rating, cutting power to stop the furnace during an overheat event — a critical last-line safety device. A blown link means no operation and points to a root cause such as a dirty filter, blocked ductwork, or a failing blower.
The trip temperature and current rating of a fusible link must exactly match the furnace's safety design. The genuine Goodman 144°C link is calibrated for the GDE120-5 — substituting a link with the wrong rating can either nuisance-trip or, worse, fail to protect against overheating. For a safety fuse, always use the exact OEM part.
Shut off power, note the two lead connections, and splice/attach the new link in place of the blown one. Around 15 minutes with basic tools. Important: always diagnose why the original link opened (restricted airflow, bad blower, blocked vent) before returning the furnace to service, or the replacement will blow again.